Indeed, luminosity amplitude and timescales vary depending on the origin of such variability [1]}. Temporal changes over timescales of days and amplitudes less than one order of magnitude in the accretion rate (the so-called routine variability) are often attributed to the rotation of the star and are very useful in measuring its rotation period [2]}, [3]}, [4]}, [5]}.
However, this is not exclusively the case as the rotation contribution might hide any intrinsic changes that come from the stellar-disk magnetospheric interaction.
On the other hand, the so-called accretion bursts with larger amplitude (more than one order of magnitude) and timescale variability (from months to years) are more related to the disk's mass transport and refurbishment, and they might originate from disk instabilities and other related mechanisms relevant to EXor and FUor phases [6]}.
